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Performance Optimizations

This document tracks performance improvements made to Codex.

Caching Layer (Implemented)

What Was Added

A comprehensive in-memory caching system with TTL (Time To Live) support:

  • Cache Service (server/src/services/cache.ts)
    • 30-second TTL by default
    • Pattern-based invalidation
    • Automatic expiry checking

What Gets Cached

  1. Folder Tree (getFolderTree)

    • Most frequently called operation
    • Rarely changes
    • Massive performance win for initial load

  2. Page Lists (getPages)

    • Cached per folder
    • Invalidated when pages are created/deleted/moved

  3. Page Content (getPageContent)

    • Cached by file path
    • Invalidated on save

Cache Invalidation Strategy

Cache is automatically invalidated when:

  • Creating a page: Invalidates folder's page list
  • Updating a page: Invalidates that page's content
  • Deleting a page: Invalidates folder's page list + page content
  • Renaming a page: Invalidates both old and new folder lists
  • Moving a page: Invalidates both source and destination folders
  • Creating a folder: Invalidates entire folder tree
  • Deleting a folder: Invalidates folder tree + all pages in folder
  • Renaming a folder: Invalidates folder tree + page lists

Performance Improvements

Parallelized Directory Scanning:

  • Changed getFolderTree from sequential await in loop to Promise.all()
  • Subdirectories are now scanned in parallel

Reduced Polling:

  • Preview component polling reduced from 3s to 10s
  • Reduces server load significantly

Expected Impact

  • Initial Load: 50-70% faster (folder tree cached)
  • Page Navigation: 40-60% faster (content cached)
  • Folder Browsing: 30-50% faster (page lists cached)
  • Server Load: Reduced by ~60% (fewer filesystem calls)

Git Optimizations (Already Implemented)

  • Non-blocking commits in production mode
  • Synchronous commits only in test mode
  • Commit queue prevents lock conflicts
  • Lazy initialization (doesn't block server startup)

Future Optimizations (Not Yet Implemented)

HTTP-Level Caching

  • Add ETags to responses
  • Enable browser-side caching
  • 304 Not Modified responses

Background Indexing

  • Pre-build folder tree on startup
  • Watch filesystem for changes
  • Invalidate cache based on file events

Database Layer

  • SQLite for metadata (faster than filesystem scans)
  • Keep markdown on filesystem, metadata in DB
  • Instant folder tree/page list responses

Streaming Responses

  • Stream large page content instead of loading entirely
  • Pagination for folders with many pages

Monitoring

To check cache effectiveness, use the getStats() method in production logs:

console.log('Cache stats:', fileSystemService.cache.getStats());

This shows cache size and active keys.